CN111536806A - Water-borne flue gas waste heat utilization system with acid dew point online monitoring function - Google Patents
Water-borne flue gas waste heat utilization system with acid dew point online monitoring function Download PDFInfo
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- CN111536806A CN111536806A CN202010394887.2A CN202010394887A CN111536806A CN 111536806 A CN111536806 A CN 111536806A CN 202010394887 A CN202010394887 A CN 202010394887A CN 111536806 A CN111536806 A CN 111536806A
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- Prior art keywords
- flue gas
- heat exchanger
- dew point
- waste heat
- air
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
- F23J3/026—Cleaning furnace tubes; Cleaning flues or chimneys cleaning the chimneys
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Supply (AREA)
Abstract
The invention belongs to the field of flue gas waste heat utilization, in particular to a hydrophily type flue gas waste heat utilization system with acid dew point online monitoring, aiming at the problem that the prior system is inconvenient to recycle the low-temperature flue gas waste heat, the invention proposes the following scheme, which comprises an air blower, wherein the air blower is connected with an air preheater, the air preheater is connected with an industrial kiln and a flue gas heat exchanger, the air preheater and the flue gas heat exchanger are provided with electric valves, the flue gas heat exchanger is connected with a chimney, and a flue gas acid dew point online detector is arranged between the flue gas heat exchanger and the chimney. Meanwhile, the temperature space for waste heat utilization is controlled, so that the efficiency of waste heat utilization is improved.
Description
Technical Field
The invention relates to the technical field of flue gas waste heat utilization, in particular to a water-borne flue gas waste heat utilization system with an acid dew point online monitoring function.
Background
With the continuous development of industry, China faces the situation of resource shortage and energy shortage. Meanwhile, with the continuous improvement of the market economic system, domestic enterprises face increasingly more global market competition, most enterprises face the situation of lower profit, and on the other hand, the enterprises can only deal with the situation from two aspects of strengthening market development and strengthening cost control. Among the costs of industrial enterprises, energy has become the largest cost following the cost of raw materials and labor, and particularly in some high-energy-consumption enterprises, energy expenditure has become the most important cost. Due to various reasons such as management, process, technology and the like, energy utilization efficiency of many enterprises is generally low, and energy-saving potential is huge, so that energy cost is reduced through technical improvement measures, and profit margin is increased.
The calculation of the acid dew point of the flue gas is an important link in the design of a low-temperature flue gas utilization heat exchanger, the temperature of the flue gas outlet of the heat exchanger is higher than the acid dew point temperature to avoid acid corrosion, and the temperature is generally selected to be higher than the acid dew point by 30-50 ℃ to avoid the acid corrosion in consideration of the fluctuation of the acid dew point temperature caused by the change of flue gas components, but waste heat is also caused; if the fluctuation of the acid dew point of the flue gas causes the temperature of the flue gas at the outlet of the heat exchanger to be lower than the acid dew point temperature, the phenomenon of acid corrosion of the heat exchanger can be caused.
Aiming at the problem that the low-temperature flue gas waste heat is inconvenient to deeply recycle in the prior art, a hydrophily type flue gas waste heat utilization system with an acid dew point online monitoring function is provided for solving the problem.
Disclosure of Invention
The invention aims to solve the defect that the deep recycling of low-temperature flue gas waste heat is inconvenient in the prior art, and provides a water-borne flue gas waste heat utilization system with an acid dew point online monitoring function.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a hydrophily formula flue gas waste heat utilization system with sour dew point on-line monitoring, includes the air-blower, the air-blower is connected with air heater, and air heater is connected with industrial kiln and gas heater, and air heater and gas heater are equipped with the motorised valve, be connected with the chimney on the gas heater, be equipped with the sour dew point on-line measuring appearance of flue gas between gas heater and the chimney, be connected with the soot blower on the gas heater.
Preferably, the industrial kiln is connected with a flue gas side heat exchanger, and the flue gas side heat exchanger is connected with an air side heat exchanger.
Preferably, one side of the air side heat exchanger is connected with the industrial kiln, and the other side of the air side heat exchanger is provided with an air inlet.
Preferably, a flow regulating valve is arranged between the flue gas side heat exchanger and the air side heat exchanger.
Preferably, circulating water pumps are arranged on the flue gas side heat exchanger and the air side heat exchanger.
Preferably, the flue gas side heat exchanger is connected with an induced draft fan.
Preferably, the circulating water pump is connected with a water replenishing port.
Preferably, the flue gas heat exchanger is provided with a flue gas inlet.
Compared with the prior art, the invention has the beneficial effects that:
(1) an induced draft fan and a bypass flue are added, a flue gas heat exchanger is installed on the bypass flue, and flue gas is introduced into an original chimney through the induced draft fan after passing through the heat exchanger.
(2) A blower and a corresponding air duct are added, and combustion-supporting air enters the combustor through a furnace bottom air distribution pipe after being preheated by an air side heat exchanger.
(3) For the convenience of overhauling or influencing the operation of the heating furnace when the preheater breaks down, the flue gas pipeline is provided with a pneumatic gate valve, the air duct at the bottom of the furnace is provided with an electric quick-opening valve, when the preheating system breaks down, the waste heat system can be quickly separated from the flue gas system of the heating furnace through the automatic control system, and the heating furnace is recovered to the original natural ventilation combustion mode, so that the heating furnace can independently and normally run.
(4) The soot blower is additionally arranged on the flue gas heat exchanger, so that on-line periodic soot blowing can be realized, and the influence of soot deposition on the pipe wall on the heat transfer effect is prevented.
The invention can recycle the low-temperature flue gas waste heat, reduces the energy consumption, saves the production cost, controls the heat exchange amount by monitoring the flue gas dew point temperature in real time and regulating the flow of the liquid phase medium, thereby controlling the flue gas temperature to be always higher than the dew point temperature by 10 ℃ to avoid corrosion, and simultaneously controlling the temperature space of waste heat utilization, thereby improving the efficiency of waste heat utilization.
Drawings
FIG. 1 is a schematic structural diagram of a water-borne flue gas waste heat utilization system with on-line monitoring of acid dew point according to the present invention;
FIG. 2 is a working schematic diagram of a water-borne air preheater of the water-borne flue gas waste heat utilization system with on-line monitoring of the acid dew point, which is provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-2, a hydrophily type flue gas waste heat utilization system with acid dew point online monitoring comprises an air blower, wherein the air blower is connected with an air preheater, the air preheater is connected with an industrial kiln and a flue gas heat exchanger, and the air preheater and the flue gas heat exchanger are provided with electric valves;
the flue gas heat exchanger is connected with a chimney, a flue gas acid dew point online detector is arranged between the flue gas heat exchanger and the chimney, a soot blower is connected with the flue gas heat exchanger, a dew point temperature online detector is additionally arranged at the outlet of the flue gas heat exchanger, an analog quantity signal is output to a PLC/DCS system host, the flow of a heating medium is controlled through an automatic regulating valve, the total heat exchange amount is indirectly regulated, and therefore the regulation and control of the temperature of a flue gas outlet are realized. Because the fluctuation of the components of the flue gas can lead to the change of acid dew points, the hidden danger of corroding equipment and a flue can be brought, so that the scheme controls the heat exchange quantity by adjusting the flow of a liquid-phase medium through monitoring the dew point temperature of the flue gas in real time, controls the temperature of the flue gas to be higher than the dew point temperature by 10 ℃ all the time so as to avoid corrosion, and simultaneously controls the temperature space of waste heat utilization, thereby improving the efficiency of waste heat utilization.
In the invention, the industrial kiln is connected with a flue gas side heat exchanger, and the flue gas side heat exchanger is connected with an air side heat exchanger.
In the invention, one side of the air side heat exchanger is connected with the industrial kiln, and the other side of the air side heat exchanger is provided with an air inlet.
In the invention, a flow regulating valve is arranged between the flue gas side heat exchanger and the air side heat exchanger.
In the invention, circulating water pumps are arranged on the flue gas side heat exchanger and the air side heat exchanger.
In the invention, the flue gas side heat exchanger is connected with an induced draft fan.
In the invention, the circulating water pump is connected with a water replenishing port.
In the invention, the flue gas heat exchanger is provided with a flue gas inlet.
The water medium type air preheater has the characteristics that: the water heat medium air preheater does not need to mix the flue gas and the air together for heat exchange like a common air preheater, so the arrangement is simple, and the investment and the occupied area are saved. The heat pipe type air preheater needs a huge flue to lead the flue gas to a chimney for emission, so that the investment is high and the occupied area is large. Particularly, in the reconstruction projects of some devices, the heat pipe type air preheater cannot be arranged due to the limitation of occupied land; the water heating medium air preheater is provided with a bypass adjusting system, and the amount of water entering the flue gas heat exchanger can be controlled through an adjusting valve; a dew point calculation module is added in a computer, and the dew point temperature of the flue gas is calculated by utilizing the components of the fuel gas or the components of the flue gas for on-line control; the opening degree of a bypass regulating valve is controlled through the temperature of an outlet measuring point of the flue gas heat exchanger, so that the flow of circulating water is changed, and the temperature of a flue gas outlet is controlled; due to the adoption of the module for calculating the dew point temperature of the flue gas on line, the hydrothermal medium air preheater system can adapt to working conditions of different fuels and flue gas quantities, the temperature of the lowest pipe wall on the flue gas side is higher than the dew point temperature, and the flue gas waste heat is deeply utilized under the condition of avoiding low-temperature dew point corrosion; because of hydrothermal medium air heater is with the deoxidization water or demineralized water as the medium, and set up moisturizing mouth, gas vent and relief valve in the system, can adjust circulating water pressure according to different operating modes, it is unusual at the heating furnace short time operation, when air heater flue gas temperature is higher than normal design value to advance, hydrothermal medium air heater can not take place like heat pipe air heater's the phenomenon of heat pipe inefficacy or even the pipe explosion, life is higher than heat pipe air heater or tubular air heater far away.
Economic benefits are as follows:
according to empirical data, the fuel consumption per ton of the heating furnace can be estimated to be saved by about 1.5kg/t, if the fuel gas is calculated according to 80% of the load of the heating furnace, namely the annual treatment capacity is 480000 tons, the fuel gas can be saved by about 720 tons in one year, the price of the fuel gas is calculated according to 2105 yuan/ton, the fuel cost can be saved by 151.5 ten thousand yuan in one year, the electricity consumption cost per year of the newly-added equipment is removed by 37.2 ten thousand (the annual use time is 8000 hours), the economic benefit obtained per year after the transformation is 114.3 ten thousand yuan, and the static investment recovery period is about 1.8 years.
If calculated according to the heat recovery quantity of 1500kw, the heat value of the fuel is 29.3MJ/Nm3The heat recovery efficiency is calculated as 80 percent and is equivalent to saving fuel of 1179500m each year3Density of 0.654kg/m3771 tons are saved every year, 155.3 ten thousand yuan is saved according to 2105 yuan/ton, the electricity consumption cost is removed by 37.2 ten thousand yuan, the economic benefit is 118.1 ten thousand yuan every year, and the static investment recovery period is about 1.75 years
In the invention, an induced draft fan and a bypass flue are added, a flue gas heat exchanger is arranged on the bypass flue, flue gas is introduced into an original chimney by the induced draft fan after passing through the heat exchanger, an air blower and a corresponding air flue are added, combustion-supporting air is preheated by an air side heat exchanger and then enters a burner through a furnace bottom air distribution pipe, in order to facilitate maintenance or influence the operation of a heating furnace when a preheater fails, a pneumatic gate valve is arranged on a flue gas pipeline, an electric quick-opening valve is arranged on a furnace bottom air flue, when a preheating system fails, a waste heat system can be quickly separated from a flue gas system of the heating furnace through an automatic control system, the heating furnace is recovered to an original natural ventilation combustion mode, the heating furnace can independently and normally operate, a soot blower is additionally arranged on the flue gas heat exchanger.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A hydrophily type flue gas waste heat utilization system with acid dew point online monitoring comprises an air blower, and is characterized in that the air blower is connected with an air preheater, the air preheater is connected with an industrial kiln and a flue gas heat exchanger, and the air preheater and the flue gas heat exchanger are provided with electric valves;
the flue gas heat exchanger is connected with a chimney, a flue gas acid dew point online detector is arranged between the flue gas heat exchanger and the chimney, and the flue gas heat exchanger is connected with a soot blower.
2. The water-borne flue gas waste heat utilization system with the acid dew point online monitoring function as claimed in claim 1, wherein the industrial kiln is connected with a flue gas side heat exchanger, and the flue gas side heat exchanger is connected with an air side heat exchanger.
3. The water-borne flue gas waste heat utilization system with the acid dew point online monitoring function as claimed in claim 2, wherein one side of the air-side heat exchanger is connected with the industrial kiln, and the other side of the air-side heat exchanger is provided with an air inlet.
4. The system for utilizing the waste heat of the water-borne flue gas with the online acid dew point monitoring function as claimed in claim 2, wherein a flow regulating valve is arranged between the flue gas side heat exchanger and the air side heat exchanger.
5. The system for utilizing the waste heat of the water-borne flue gas with the online acid dew point monitoring function as claimed in claim 2, wherein circulating water pumps are arranged on the flue gas side heat exchanger and the air side heat exchanger.
6. The system for utilizing the waste heat of the water-borne flue gas with the online acid dew point monitoring function according to claim 2, wherein an induced draft fan is connected to the flue gas side heat exchanger.
7. The water-borne flue gas waste heat utilization system with the acid dew point online monitoring function according to claim 5, wherein the circulating water pump is connected with a water replenishing port.
8. The water-borne flue gas waste heat utilization system with the acid dew point online monitoring function according to claim 1, wherein a flue gas inlet is formed in the flue gas heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010394887.2A CN111536806A (en) | 2020-05-11 | 2020-05-11 | Water-borne flue gas waste heat utilization system with acid dew point online monitoring function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010394887.2A CN111536806A (en) | 2020-05-11 | 2020-05-11 | Water-borne flue gas waste heat utilization system with acid dew point online monitoring function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113731147A (en) * | 2021-08-20 | 2021-12-03 | 中国船舶重工集团公司第七一一研究所 | CO recovery by using ship tail gas waste heat2System and control method |
| CN115216316A (en) * | 2022-07-18 | 2022-10-21 | 马鞍山钢铁股份有限公司 | Prevent putting out stove feedwater preheater dew point corrosion temperature regulation and control system futilely |
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| CN203823738U (en) * | 2014-05-19 | 2014-09-10 | 湖北国众科技股份有限公司 | Novel flue gas waste heat recovering system |
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2020
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN200972137Y (en) * | 2006-11-15 | 2007-11-07 | 上海宁松热能环境工程有限公司 | Combined water thermal media air preheater |
| CN201517894U (en) * | 2009-09-21 | 2010-06-30 | 江苏焱鑫科技股份有限公司 | Industrial furnace combustion smoke waste heat recycling system suitable for fuel oil work conditions |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113731147A (en) * | 2021-08-20 | 2021-12-03 | 中国船舶重工集团公司第七一一研究所 | CO recovery by using ship tail gas waste heat2System and control method |
| CN115216316A (en) * | 2022-07-18 | 2022-10-21 | 马鞍山钢铁股份有限公司 | Prevent putting out stove feedwater preheater dew point corrosion temperature regulation and control system futilely |
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Address after: 518000 201, 202, building 7, Shenzhen Software Park, high tech Industrial Park, Nanshan District, Shenzhen City, Guangdong Province Applicant after: Shenzhen Aoyu Low Carbon Technology Co.,Ltd. Address before: 518000 201, 202, building 7, Shenzhen Software Park, high tech Industrial Park, Nanshan District, Shenzhen City, Guangdong Province Applicant before: SHENZHEN AOTO-UNION ENERGY SAVING TECHNOLOGY CO.,LTD. |
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Application publication date: 20200814 |
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